Câu hỏi của Trần Ngọc Tuệ Đình

Question

1> Xac dinh A , B, C, D, E va hoan thanh PTHH

a) A + Fe2O3 to ----> B + NaOH -----> C + HCl--->D + H2SO4 ----> E + Mg to-->A

b) A+Fe2O3 to ==> B+Cl2==>C+ NaOH==>D +to==>E+H2 to==>B

c) A + O2 ---> B...

Hồ Hữu Phước · Accepted Answer

a)

2Al+Fe2O3$\rightarrow$Al2O3+2Fe

Al2O3+2NaOH$\rightarrow$2NaAlO2+H2O

NaAlO2+HCl+H2O$\rightarrow$Al(OH)3+NaCl

2Al(OH)3+3H2SO4$\rightarrow$Al2(SO4)3+6H2O

3Mg+Al2(SO4)3$\rightarrow$3MgSO4+2Al

A-Al, B-NaAlO2, C-Al(OH)3, D-Al2(SO4)3

b)

2Al+Fe2O3$\rightarrow$Al2O3+2Fe

2Fe+3Cl2$\rightarrow$2FeCl3

FeCl3+3NaOH$\rightarrow$Fe(OH)3+3NaCl

2Fe(OH)3$\rightarrow$Fe2O3+3H2O

Fe2O3+3H2$\rightarrow$2Fe+3H2O

A-Al, B-Fe, C-FeCl3, D-Fe(OH)3, E-Fe2O3

c)

4Al+3O2$\rightarrow$2Al2O3

Al2O3+6HCl$\rightarrow$2AlCl3+3H2O

AlCl3+3NaOH$\rightarrow$Al(OH)3+3NaCl

Al(OH)3+NaOH$\rightarrow$NaAlO2+2H2O

NaAlO2+HCl+H2O$\rightarrow$Al(OH)3+NaCl

A-Al, B-Al2O3, C-AlCl3, D-Al(OH)3, E-NaAlO2Câu trả lời: a)

2Al+Fe2O3$\rightarrow$Al2O3+2Fe

Al2O3+2NaOH$\rightarrow$2NaAlO2+H2O

NaAlO2+HCl+H2O$\rightarrow$Al(OH)3+NaCl

2Al(OH)3+3H2SO4$\rightarrow$Al2(SO4)3+6H2O

3Mg+Al2(SO4)3$\rightarrow$3MgSO4+2Al

A-Al, B-NaAlO2, C-Al(OH)3, D-Al2(SO4)3

b)

2Al+Fe2O3$\rightarrow$Al2O3+2Fe

2Fe+3Cl2$\rightarrow$2FeCl3

FeCl3+3NaOH$\rightarrow$Fe(OH)3+3NaCl

2Fe(OH)3$\rightarrow$Fe2O3+3H2O

Fe2O3+3H2$\rightarrow$2Fe+3H2O

A-Al, B-Fe, C-FeCl3, D-Fe(OH)3, E-Fe2O3

c)

4Al+3O2$\rightarrow$2Al2O3

Al2O3+6HCl$\rightarrow$2AlCl3+3H2O

AlCl3+3NaOH$\rightarrow$Al(OH)3+3NaCl

Al(OH)3+NaOH$\rightarrow$NaAlO2+2H2O

NaAlO2+HCl+H2O$\rightarrow$Al(OH)3+NaCl

A-Al, B-Al2O3, C-AlCl3, D-Al(OH)3, E-NaAlO2

Bài 5. Luyện tập: Tính chất hóa học của oxit, axit